Text /Pic Replace

[neo_philiac]

Its just a simple thing but I forgot how to do it. I just want to replace the text with Picture when mouse-over. Its an overlap thing. Can anyone give me the code?

[Twey]

<span
  onmouseover="
    while(this.hasChildNodes)
      this.removeChild(this.firstChild);
    this.appendChild(
      document.createElement('img')
    ).src = '/path/to/image.png';
    this.onmouseover = null;
  "
>
  Some text
</span>